Assuming it uses the same docking connector you should be able to use any iPod charger as well as a USB charging cable.
Maybe.... as long as it's not an older charger that supplies the higher Firewire voltage. The Docking connector had provisions for BOTH USB and Firewire charging (using different pins).
A lot of third-party chargers sold until last year supplied only the Firewire voltages (something like 8 to 30 volts) and not the well regulated USB 5.0 volts.
Apple had warned of the dropping of iPod Firewire charging for a couple of years, but when they actually dropped it last year, a lot of third-party manufacturers were STILL unprepared.